Magento - snippets

Add an existing attribute to a attribute set

$attributeSetName = 'Editorial Product';
// active_from
$entityTypeId = Mage::getModel('eav/entity')
    ->setType('catalog_product')
    ->getTypeId();

$setId = $installer->getAttributeSet($entityTypeId, $attributeSetName, 'attribute_set_id');

// Add attribute set if it does not exists
if($setId === null) {
    $installer->addAttributeSet($entityTypeId, $attributeSetName);
    $setId = $installer->getAttributeSet($entityTypeId, $attributeSetName, 'attribute_set_id');
}

$groupId = $this->_generalGroupName;
$attributeId = $this->getAttribute($entityTypeId, 'active_from', 'attribute_id');;

if($entityTypeId !== null && $setId !== null && $attributeId !== null) {
    $installer->addAttributeToSet($entityTypeId, $setId, $groupId, $attributeId);
}

Add attribute and attribute groups

$entityTypeId     = $installer->getEntityTypeId('catalog_category');
$attributeSetId   = $installer->getDefaultAttributeSetId($entityTypeId);
$attributeGroupId = $installer->getDefaultAttributeGroupId($entityTypeId, $attributeSetId);

// update General Group
$installer->updateAttributeGroup($entityTypeId, $attributeSetId, $attributeGroupId, 'attribute_group_name', 'General Information');
$installer->updateAttributeGroup($entityTypeId, $attributeSetId, $attributeGroupId, 'sort_order', '10');

$groups = array(
    'display'   => array(
        'name'  => 'Display Settings',
        'sort'  => 20,
        'id'    => null
    ),
    'design'    => array(
        'name'  => 'Custom Design',
        'sort'  => 30,
        'id'    => null
    )
);

foreach ($groups as $k => $groupProp) {
    $installer->addAttributeGroup($entityTypeId, $attributeSetId, $groupProp['name'], $groupProp['sort']);
    $groups[$k]['id'] = $installer->getAttributeGroupId($entityTypeId, $attributeSetId, $groupProp['name']);
}

Programmatically update the layout from av event

config.xml
<frontend>
        <events>
            <controller_action_layout_generate_xml_before>
                <observers>
                    <rimpachidecategories>
                        <type>singleton</type>
                        <class>rimpachidecategories/observer</class>
                        <method>onControllerActionLayoutGenerateXmlBefore</method>
                    </rimpachidecategories>
                </observers>
            </controller_action_layout_generate_xml_before>
        </events>
    </frontend>

method:
/**
     * Method that will be called when the controller_action_layout_generate_xml_before event is fired.
     * Adds layout update that removes catalog.topnav depending on if the hide categories attribute is
     * toggle on the logged in customer object.
     *
     * @see Mage_Core_Controller_Varien_Action::generateLayoutXml()
     * @param Varien_Event_Observer $observer
     */
    public function onControllerActionLayoutGenerateXmlBefore($observer)
    {
        /* @var $action Mage_Core_Controller_Varien_Action */
        $action = $observer->getEvent()->getAction();

        /* @var $layout Mage_Core_Model_Layout */
        $layout = $observer->getEvent()->getLayout();

        /* @var $session Mage_Customer_Model_Session */
        $session = Mage::getSingleton('customer/session');

        if (!is_null($session) && $session->isLoggedIn() === true &&
            $session->getCustomer()->getData('ic_hide_toggle'))
        {
            $layout->getUpdate()->
                addUpdate('<reference name="top.menu"><remove name="catalog.topnav" /></reference>');
        }

    }